stand Sam

A reference to Uncle Sam, imagined as paying for supplies for the US military.

stand Sam (third-person singular simple present stands Sam, present participle standing Sam, simple past and past participle stood Sam)

1. (slang, archaic) To pay for refreshment or drink; to treat somebody to something.
   • 1959, John Dickson Carr, Scandal at High Chimneys, page 9:

     If you care to stroll into the Argyll Rooms about eleven, I'll stand sam for a bottle to celebrate.

• John Camden Hotten (1873) The Slang Dictionary

• Stamands